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Oval|Lab Grown|IGI

1.66ct D IF Oval Lab Grown Diamond

EX • D/IF • IGI LG817677086

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG817677086

Diamond specifications and retailer prices

From $288 USD
As of November 1, 2026
Save $2,832 USD (91%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $3,120 USD at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.66ct lab-grown oval diamond

This 1.66ct lab-grown oval sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG817677086 or 817677086. Listed at 24 retailers as of November 1, 2026, with prices from $288 to $3,120, a $2,832 spread on the same certified stone. Brilliant Earth lists it at $3,120. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66
Carat
D
Color
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817677086
Dimensions9.50 × 6.70 × 4.16 mm
L/W Ratio1.42
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
9.50 mm6.70 mm1.66 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG817677086
Side View
Table 60.0%Crown 35.2°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 62.1%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $3,120 USD|Low: $288 USD|High: $3,750 USD|Avg: $1,130 USD|-16.8%
Brilliant Earth
Retailer 2
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Retailer 24
November 2, 2026
Retailer 4$288 USD
Retailer 15$322 USD
Retailer 10$334 USD
Retailer 5$357 USD
Retailer 13$417 USD
Retailer 23$515 USD
Retailer 16$586 USD
Retailer 19$679 USD
Retailer 18$697 USD
Retailer 11$698 USD
Retailer 21$727 USD
Retailer 22$918 USD
Retailer 12$935 USD
Retailer 2$964 USD
Retailer 9$1,267 USD
Retailer 7$1,372 USD
Retailer 14$1,429 USD
Retailer 8$1,465 USD
Retailer 3$1,539 USD
Retailer 20$1,579 USD
Retailer 17$2,066 USD
Retailer 6$2,560 USD
Retailer 24$2,705 USD
Brilliant Earth$3,120 USD

32 data points across 24 retailers

24 retailers$288 USD to $3,120 USD

A
Cheapest Retailer
-
$288 USD
A
Retailer 2
-
$322 USD
View
Final sale: no returns
A
Retailer 3
-
$334 USD
View
A
Retailer 4
-
$357 USD
View
A
Retailer 5
-
$417 USD
£328 GBP
View
A
Retailer 6
-
$515 USD
View
A
Retailer 7
-
$586 USD
View
A
Retailer 8
-
$679 USD
ZAR 10,976 ZAR
View
A
Retailer 9
-
$697 USD
£549 GBP
View
A
Retailer 10
-
$698 USD
View
A
Retailer 11
-
$727 USD
A$1,118 AUD
View
A
Retailer 12
-
$918 USD
A$1,413 AUD
View
A
Retailer 13
-
$935 USD
View
B+
Retailer 14
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$964 USD
View
B+
Retailer 15
-
$1,267 USD
View
B+
Retailer 16
-
$1,372 USD
View
B+
Retailer 17
-
$1,429 USD
View
B+
Retailer 18
-
$1,465 USD
SGD 1,980 SGD
View
B+
Retailer 19
-
$1,539 USD
£1,212 GBP
View
B+
Retailer 20
-
$1,579 USD
£1,243 GBP
View
Retailer 21
-
$2,066 USD
A$3,179 AUD
View
Price last confirmed 25 days ago
B
Retailer 22
-
$2,560 USD
View
B
Retailer 23
-
$2,705 USD
View
Most Expensive
B
Brilliant Earth
22138102Y · Nov 2
$3,120 USD
View
23 more retailers have this diamond
Prices start from $288 USDSave up to $2,832 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.66ct Oval
$288 USD